Ramon

Can you tell us when this occurred?

Anyway, it looks like a Ruby issue apparently. I'm not an expert, but I know that RPG Maker files are made using Ruby, and according to your screenshot, your libraries or remote sources seem to be outdated. I recommend you to check them by writing "gem env" in your command prompt. Did you already have Ruby installed on your computer? From what I've heard, the following sources are unavailable:

REMOTE SOURCES

- http://gems.rubyforge.org/

- http://gems.github.com

Since these are outdated, you should add https://rubygems.org as a new source to your gem env config and remove the old ones. To do so, write the following commands:

gem sources -r http://gems.rubyforge.org/

gem sources -r http://gems.github.com

gem sources -a https://rubygems.org/

This way, your config will be updated. If you write "gem sources -l", it will return your current sources:

REMOTE SOURCES

- https://rubygems.org/

Don't hesitate to let me know if it works (or not)!